Engine Mechanical problem
2002 Mazda Millenia 6 cyl Front Wheel Drive Automatic 135000 miles
2002 mazda millenia 2.5L got loud engine noise after start up or idling. The noise seems to almost dissapear or much less noticable. When rpm above 2000rpm. 135K mile. Check engine light on with code 0300, 0350 and 0421. Changed all spark plugs recently. The local mechanics told me the noise seems from inside timing belt cover, front of oil pan, rear upper valve train and water pump. I read one post said bad timing belt tensioner could cause engine noise/knocking. Timing belt never replaced on this car. Can anyone kindly provide the advice or similar experience? Many thanks.
What's up forsoil? My gf also has a 2002 millenia with the same engine noises, basically the whole 9. She had to get her timing belt replaced once before and those same noises came back recently so it's more than likely that.
I also read where you could also be dry starting when the quality of your oil doesn't lube your engine's components immediately at crank and could cause a temporary knock, but if you keep good oil in your car again it's probably the 1st case